Granted Patent
Utility
US 4,816,172 · App. 07/122,314
Clear high-performance multifunction VI improvers
Inventors:
Maria M. Kapuscinski, Larry D. Grina, Lee Ann Brugger
Patented Case
View Patent ↗
Granted: Mar 28, 1989
Filed: Nov 18, 1987
Inventors
Maria M. Kapuscinski
Larry D. Grina
Lee Ann Brugger
Assignee (at issue)
Texaco Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.